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Area of Science:

  • Immunometabolism
  • Liver Metabolism
  • Glucose Homeostasis

Background:

  • Systemic metabolism and immune responses significantly impact glucose homeostasis, particularly in diabetes and obesity.
  • Immune metabolites mediate crosstalk, with itaconate (an inflammatory macrophage metabolite) emerging as a key player.
  • Itaconate's role in glucose metabolism, especially in obesity, is recognized but poorly understood.

Purpose of the Study:

  • To investigate the role of itaconate in liver glucose metabolism during fasting.
  • To elucidate the molecular mechanisms by which itaconate influences gluconeogenesis.
  • To determine the potential link between itaconate and metabolic-associated liver diseases.

Main Methods:

  • Metabolite analysis in liver tissue under fasting and fed conditions.
  • In vitro experiments assessing itaconate's effect on glucagon-induced gluconeogenesis.
  • Gene expression analysis (gluconeogenic genes) under various conditions (basal, palmitic acid).
  • Investigation of signaling pathways involved (insulin signaling, CREB, NRF2).

Main Results:

  • Itaconate levels significantly increase in the liver during fasting.
  • Itaconate enhances glucagon-induced liver gluconeogenesis independently of insulin signaling.
  • Itaconate upregulates gluconeogenic gene expression via NRF2 activation, not CREB.
  • Itaconate potentiates glucagon effects in the liver.

Conclusions:

  • Itaconate enhances liver gluconeogenesis through NRF2 activation, independent of insulin signaling.
  • Fasting-induced increases in itaconate may contribute to altered glucose metabolism.
  • Itaconate's role in potentiating glucagon effects suggests its involvement in metabolic-associated liver diseases.